Flush tank flapper valve



FIG. 1 is a side elevation view of a flush tank flapper valve, showingmy new design, the opposite side being a mirror image of that shown;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left end elevation view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a right end elevation view thereof.

The broken line showing of a chain in FIGS. 1, 2, 3, and 5 is forillustrative purposes only, and forms no part of the claimed design.

The ornamental design for a flush tank flapper valve, as shown anddescribed.